Improvement in sawing-machin es



UNITED STATES PATENT OFFICE.

JOHN R. "WILLAMSON AND SAMUEL FORSYTHE, OF SEABECK, WASHING- TON TERRITORY.

IMPROVEMENT IN SAWIN'G-MACHINES.

, To all whom t may concern.'

Be it known that we, JOHN R. WILLiAMsoN and SAMUEL FoRsYTHE, both of Seabeck, in the county of Kitsap and Territory of Washington, have invented certain new and useful Improvements in Sawing-Machines; and we do hereby declare that the following is a full, clear, and exact description of the same, ref erence being had to the accompanying drawings, iorming a part of this specilicationyin which- Figure 1 represents a longitudinal vertical section of our invention, taken in the plane indicated by the line zo rv, Fig. 3. Fig. 2 is a transverse vertical section of the same, the plane of section being indicated by the line y y, Fig. 3. Fig. 3 is a plan or top view of the same.

Similar letters of reference in the three views indicate corresponding parts.

Our invention consists in the arrangement of a hinged roller-arm, the rear end of which slides on the eccentric edge of the standard that serves to feed the log toward the saw, in combination with the hook or dog intended to fasten the log at the inner side, and with a liand-lever, in such a manner that by the action of said hand-lever and roller-arm the hook, together with the log, is drawn up tight against the face of the standard and held firm as the sawing proceeds, thereby saving the necessity of turning the log over more than once during the operation of sawing. It consists, further, in the arrangement of a triple crank-lever, in combination with slotted con nection-rods, and with the two shells which form the nut for thescrew that serves to feed the standard and log toward the saw in such a manner that said shells can be thrown in gear or out of gear with the feed-screw, and that the standard can be moved independent of said screw whenever desired. It consists, further, in the employment of a telescopetube in combination with and secured to the sliding standard and surrounding the screw in such a manner that an accumulation of sawdust in the screw-thread is prevented and a correct action of the` two half shells (when thrown in gear with the Screw) is insured. It consists, finally, in the arrangement of an adjustable roller on the slab side of the log, for

the purpose of keeping the lumber or the log steady and to prevent the same from springing during the operation of sawing.

To` enable those skilled in the art to make and use our invention, we will proceed to describe its construction and operation with reference to the drawings.

The carriage A is provided with two or more bed-plates or head-blocks, B, runningin a direction transversely to the carriage, which serve to support the log. Each of the headblocks B forms the guide or ways for a standard, C, to which a sliding motion is imparted in the direction toward and from the saw by a screw, D. The log is secured on the head-blocks B by a hook, c, that is hinged to a lug, b, projecting from the bottom of the standard C, and another hook,which catches into the log at its under side, serves to draw the same up tight to the face of the standard.

This hook is operated by` a hand-lever, E,

which is fulcrated on a pivot, d, projecting from the inside of the standard, and a pin or stud, e, which projects from the side of the lever E, works in a slot,f, in a bar, F, so that by the action of the lever E the slotted bar F is raised or depressed at pleasure.. One end of said bar is connected to the hook c by means of a pivot, 9 and its other end is furnished with a stud or roller-pin, 71 which slides on the edge@ of the standard G. This edge is made so that it gradually recedes from the face of the standard, so that on raising thelever E the slotted bar F,with the hookc, is allowed to project more and more beyond the face of the standard, and on depressing the lever E the hook c is gradually drawn in toward the face of the standard, so that when the lever is raised and the hook c .fastened in the log by depressing said lever the log is firmly drawn up against the face of the standard and retained during the operation of sawing. The screw D, which feeds the standard C toward the saw, works into a nut, k, which consists of two halves, so that the same can be opened to release the screw, and closed to catch into the thread and gear into the screw, as may be desired.

In order to effect the opening and closing of V the two halves of the nut k in an easy and eX- peditious manner, the upper hali' connects2 by means of a slotted rod, Z, with a crank, m, in the center of a crank-shaft, n, which has its bearings in two journal-boxes, o, secured to the bottom of the standard C, and the lower half of said nut connects by two slotted rods, p,with two cranks, q, on the ends of crank-shaft n, and standing in opposite direction to the central crank, m. Byturning said crank-shaft, therefore, the cranks m and g can be brought in such a position that the former stands up and the latter stands down, and consequently the upper half of the nut la is raised and the lower half depressed, and the screw is completely out of gear with said nut; or by turning the crank half round, so that the crank m will stand down and the crank qup, the nut is closed and brought in gear with the screw. A handle, o, on the outside of the standard C, serves to operate the crank-shaft a. (Compare also screw tand nut n in Fig. 2.) A

The screw D, which imparts motion to the standard C, is liable to ll with sawdust, which is readily cleared out by the nut on those parts over which the same travels when it is in gear with the screw; but if the nut is out of gear and the screw iills with dust, or whenever it should be attempted to throw the nut in gear with some portion of the screw which is filled with dust, the threads of the nut could not, or only partially, enter those of the screw, and the thread would be liable to become injured. Itis therefore desirable to protectfthe screw as much as possible against the'sawdust. This object we have effected by a telescope-tube, G, which surrounds the screw, and one end of which is firmly secured to the end ofthe bedplate or head-block B, and its other end to a lug, s, projecting from the under side of standard C. Vhen the standard draws away from the saw, the telescope-tube is drawn out, so that all that part'of theserew behind the standard is continually protected by the telescopetube G. By these means a large portion of the screw will always be kept clear of dust, so that the nut can at all times be thrown in gear without danger of damaging the thread by moving the standard to that portion of the screw which is clear of dust. A standard, H,

similar to standard C, runs on a bed plate or frame, I, on the off side of the saw, and said standard H is operated by a screw, t, and nut fu, constructed precisely like the screw and nut which serve to operate the standard C. The standard H carries a roller, J, the position of which is so adjusted by the screw t that it bears against the slab side of the log, or, more properly speaking, on the outside of that portion ofthe log which has already been acted upon by the saw. to prevent the lumber or logs from Vspringing and to effect the cutting without danger to the operator.

It will be readily understood by every practical sawyer that when our improvement, and particularly our improved mode of holding the log, is used, said log has to beturned over only once while being sawcd, and consequently only two slabs are taken off the log, and the sawing is effected with the same economy by the circular saw as by a gang-saw.

Having thus fully described our invention,

,what we claim as new, and desire to secure'by Letters Patent, is-

v1. The arrangement and combination of the slotted roller-arm F, eccentric `edge t' of the standard C, hook c, and hand-lever E, all constructed and operating substantially in the manner and for the purpose shown and described.

2. The arrangement of the triple crank-lcver n and slotted conneetion-rods lp, in combination with the two halves of the nuts k er o, constructed and operating in the manner and for the purpose specified.

3. The employment of the telescope-tube G, in combination with the screw D, divided nut k, and standard C, substantially as and for the purpose set forth.

4. The arrangement of the roller .T in the adjustable standard H on the slab side of the log, for the purpose described.

J. R. WILLIAMSON. SAMUEL FORSYTHE.

Witnesses:

MARsHALL BLINN, J. N. DRAPER.

The object of this roller is 

